MAZ said:
Are you freaking kidding? What the hell makes you think the best a dealer gets showing a 9 or 10 is a 17?
That is, if he has to draw. If he doesn't have to draw it doesn't matter what the next card is. But an ace as a drawn third card can only hurt the dealer when he shows 9 or 10. We don't know what the fourth card is.
MAZ said:
Giving a dealer an ace is just not the right move. Unless you know the holecard, an ace will give the dealer a chance to draw possibly more than once, which you don't want. Steering a 10 to the dealer is the right play in this situation. If the dealer needs to hit then its a gaurantee to bust with a dealer 10 showing, and the only card that can beat you with his 9 would be a 2. If there is no need for a dealer draw, then give yourself the 10 next round.